wind.dl_2: Wind-data download

In rWind: Download, Edit and Include Wind and Sea Currents Data in Ecological and Evolutionary Analysis

Description

wind.dl_2 downloads time-series wind data from the Global Forecast System (GFS) of the USA's National Weather Service (NWS) (https://www.ncei.noaa.gov/products/weather-climate-models/global-forecast). Wind data are taken from NOAA/NCEP Global Forecast System (GFS) Atmospheric Model collection. Geospatial resolution is 0.5 degrees (approximately 50 km), and wind is calculated for Earth surface, at 10 m. More metadata information: http://oos.soest.hawaii.edu/erddap/info/NCEP_Global_Best/index.html

Usage

wind.dl_2(time, lon1, lon2, lat1, lat2, type = "read-data", trace = 1)

## S3 method for class 'rWind_series'
x[[i, exact = TRUE]]

Arguments

time	a scalar or vector of POSIXt or Date objects or an character which can transformed into those, see example below. There are currently these options at the GFS database for the hours: 00:00 - 03:00 - 06:00 - 09:00 - 12:00 - 15:00 - 18:00 - 21:00 (UTC) (TO).
lon1	Western longitude
lon2	Eastern longitude
lat1	Southern latitude
lat2	Northern latitude
type	Output type. "read-data" is selected by default, creating an R object. If you choose "csv", wind.dl create a a CSV file in your work directory named "wind_yyyy_mm_dd_tt.csv".
trace	if trace = 1 (by default) track downloaded files
x	object from which to extract element(s).
i	indices specifying elements to extract.
exact	Controls possible partial matching (not used yet).

Details

To get the same format as wind.dl, you should run tidy function from wind.dl_2 output. The output type is determined by type="csv" or type="read-data". If type="csv" is selected, the function creates a "wind_yyyy_mm_dd_tt.csv" file that is downloaded at the work directory. If type="read-data" is selected, an rWind_series object is created.

Value

an object of class rWind_series or .csv file/s with U and V vector components and wind direction and speed for each coordinate in the study area defined by lon1/lon2 and lat1/lat2.

Note

wind.dl_2 requires two dates that represent the boundaries of the time lapse to download wind series data. U and V vector components allow you to create wind averages or tendencies for each coordinate at the study area. Longitude coordinates are provided by GFS dataset in 0/360 notation and transformed internally into -180/180. "dir" denotes where the wind/sea current is going (toward), not from where is coming.

Author(s)

Javier Fernández-López ([e-mail])

References

http://www.digital-geography.com/cloud-gis-getting-weather-data/#.WDOWmbV1DCL

http://oos.soest.hawaii.edu/erddap/griddap/NCEP_Global_Best.graph

See Also

wind.mean, wind2raster, wind.dl, as_datetime, as.POSIXct

Examples

# Download wind for Iberian Peninsula region at 2015, February 12, 00:00
## Not run: 

wind.dl_2("2018/3/15 9:00:00", -10, 5, 35, 45)

library(lubridate)
dt <- seq(ymd_hms(paste(2018, 1, 1, 00, 00, 00, sep = "-")),
  ymd_hms(paste(2018, 1, 2, 21, 00, 00, sep = "-")),
  by = "3 hours"
)
ww <- wind.dl_2(dt, -10, 5, 35, 45)
tidy(ww)

## End(Not run)

rWind documentation built on Oct. 19, 2021, 5:06 p.m.